feat(api): 叙事 prompt、职业上下文、读路径章节、WS 解耦与错误脱敏

- 回忆录：事实边界补充允许清单；传记文体示例与 JSON 叙事要求对齐
- default 职业提示 occupation_context；cadre/military 退休语境
- GET 章节读路径零写入，prepare_chapter_read_view + markdown_for_response
- 文本归一抽到 core/text_normalize；移除弃用 reply 策略与 recompose_chapters_for_story
- ConversationService：WS 连接/用户段落/结束对话；对外错误固定文案
- 测试：HTTP 脱敏契约、章节读视图、occupation 与 background_voice

api/app/agents/chat/orchestrator.py

@@ -203,6 +203,7 @@ class ChatOrchestrator:
 
         user_profile_context = ""
         background_voice = "default"
+        occupation = ""
         if user:
             user_profile_context = format_user_profile_context(
                 birth_year=user.birth_year,
@@ -211,6 +212,7 @@ class ChatOrchestrator:
                 occupation=user.occupation,
             )
             background_voice = infer_background_voice(user.occupation)
+            occupation = user.occupation or ""
 
         memory_evidence_text = await _fetch_interview_memory_evidence(
             db, user_id, normalized_user_message
@@ -225,6 +227,7 @@ class ChatOrchestrator:
             memory_evidence_text=memory_evidence_text,
             background_voice=background_voice,
             normalized_user_message=normalized_user_message,
+            occupation=occupation,
         )
         if agent_summary_enabled():
             logger.info(
@@ -297,6 +300,7 @@ class ChatOrchestrator:
         memory_evidence_text: str = "",
         background_voice: str = "default",
         normalized_user_message: str | None = None,
+        occupation: str = "",
     ) -> AgentChatTurn:
         """委托 InterviewAgent 生成访谈回复（持久化由调用方负责）。"""
         return await self.interview_agent.generate_response_with_state(
@@ -308,6 +312,7 @@ class ChatOrchestrator:
             memory_evidence_text=memory_evidence_text,
             background_voice=background_voice,
             normalized_user_message=normalized_user_message,
+            occupation=occupation,
         )
 
     def detect_user_stage(self, user_message: str) -> str:
@@ -320,6 +325,7 @@ class ChatOrchestrator:
         memoir_state: MemoirStateSchema,
         user_profile_context: str = "",
         background_voice: str = "default",
+        occupation: str = "",
     ) -> List[str]:
         """
         委托 InterviewAgent 生成访谈开场白（持久化由调用方 ConversationHistoryStore 负责）。
@@ -329,4 +335,5 @@ class ChatOrchestrator:
             memoir_state=memoir_state,
             user_profile_context=user_profile_context,
             background_voice=background_voice,
+            occupation=occupation,
         )